An equation for a chemical reaction can provide us with a lot of useful information. It tells us what the reactants and the products are in the reaction, and it also tells us the ratio in which the reactants combine to form products. In this tutorial, we will look at chemical equations and quantitative aspects of chemical change. After we learn about writing chemical equations and about the information that can be obtained from a balanced chemical equation, we are going to explore these concepts further and learn more about gases, solutions and reactions. We will explore the concept of theoretical yield in greater detail and learn about limiting reagents.